Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, …

Explore how atomic mass changes with atomic number in the periodic table of elements via interactive plots.

Molecules, atoms, and ions of the stable isotopes of oxygen possess slightly different physical and chemical properties, and they commonly will be fractionated during physical, chemical, …

Periodic Table element Summary Magnesium. Magnesium is a chemical element with symbol Mg and atomic number 12. Classified as an alkaline earth metal, Magnesium is a solid at room …

IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) Yttrium was discovered by Johan Gadolin, a Finnish chemist, while analyzing the composition of the …

IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) Nitrogen was discovered by the Scottish physician Daniel Rutherford in 1772. It is the fifth most abundant …

Molecules, atoms, and ions of the stable isotopes of hydrogen possess slightly different physical and chemical properties and they are commonly fractionated during physical, chemical, and …

The atomic radius of a chemical element is a measure of the size of its atom, usually, the distance from the center of the nucleus to the outermost isolated electron. Because an atom does not …

IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) 4 Description Phosphorus exists in four or more allotropic forms: white (or yellow), red, and black (or violet).

IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) Vanadium was discovered by Andrés Manuel del Rio, a Spanish chemist, in 1801. Rio sent samples of …